Xref: utzoo comp.unix.wizards:15075 comp.bugs.sys5:808
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!pasteur!ames!lll-winken!uunet!mcvax!ukc!axion!fulcrum!igb
From: igb@Fulcrum.BT.CO.UK (Ian G Batten)
Newsgroups: comp.unix.wizards,comp.bugs.sys5
Subject: setuid (euid) after setuid (uid) on System 5
Message-ID: <123@cat.Fulcrum.BT.CO.UK>
Date: 14 Mar 89 18:38:08 GMT
Organization: BT Fulcrum, Birmingham, England.
Lines: 24


Should the following program work or not, on System Five?  This is a
common idiom in the source code of HoneyDanber uucp, and two local System
Five machines refuse to honour the second setuid.  The manual page implies
they should.  Please, no flames --- just mail me an answer.  I've been
sweating blood over the code all day and I hope I can lodge this as a
kernel problem.

ian

main ()
{
  int uid, euid;

  printf ("uid = %d; euid = %d\n", uid = getuid (), euid = geteuid ());
  if (setuid (uid) != 0)
    perror ("setuid (uid)");
  printf ("uid = %d; euid = %d\n", getuid (), geteuid ());
  if (setuid (euid) != 0)
    perror ("setuid (euid)");
  printf ("uid = %d; euid = %d\n", getuid (), geteuid ());
}
-- 
Ian G Batten, BT Fulcrum - igb@fulcrum.bt.co.uk - ...!uunet!ukc!fulcrum!igb